文構造解説
Think of the last time {you were in a situation where you weren't
先行詞
when が省略されている
in which
totally sure (how to behave)}. Maybe it was (your first time in a
not totally ~ 「完全には~ではない」
=前文の the last time~ behave までを指す
Led....
new school), or (your first time in another country), or (a dinner
back mod.
party where you didn't know many of the guests). What did you
at which
many は代名詞
do to try to fit in?
「(雰囲気などに) 溶け込む」